Doris Salcedo, Caravaggio and Jacob Zuma exposed – the week in art

Salcedo brings her unsettling world to London's White Cube, feast your eyes on a Caravaggio at the National Gallery, and the South African president sees red over a revealing portrait –
all in your favourite weekly art dispatch

Masterpiece of the week

Food for thought ... detail from The Supper at Emmaus, 1601, by Caravaggio. Photograph: National Gallery, London

Caravaggio, The Supper at EmmausThe genius of Caravaggio for painting still life glistens in the food on the table as the risen Christ reveals himself at a humble repast. Extremely lifelike details – a shell, a chicken – and a radical foreshortening of outstretched arms make this painting intrude into our world. It is as alive as life.•National Gallery, London

Image of the week

Unwanted exposure ... the painting of Jacob Zuma after it was defaced by two men with red and black paint. Photograph: Jerome Delay/AP